Module: ROF::Translators::JsonldToRof::StatementHandler

Defined in:
lib/rof/translators/jsonld_to_rof/statement_handler.rb

Overview

Responsible for parsing an RDF statement and adding to the accumulator.

See Also:

Defined Under Namespace

Classes: UnhandledRdfSubjectError

Class Method Summary collapse

Class Method Details

.call(statement, accumulator) ⇒ ROF::Translators::JsonldToRof::Accumulator

Note:

It is assumed that all blank nodes (e.g. RDF::Node) will be processed before you process any RDF::URI nodes.

Parse the RDF statement and add it’s contents to the accumulator

Examples:

Given the following 4 RDF N-Triples (subject, predicate, object). The first two, with subject "_:b0" represent blank nodes.
The last one with subject "<https://curate.nd.edu/show/zk51vd69n1r>" has an object that points to the "_:b0" blank node.
  _:b0 <http://purl.org/dc/terms/contributor> "David R.Hyde" .
  _:b0 <http://www.ndltd.org/standards/metadata/etdms/1.1/role> "Research Director" .
  <https://curate.nd.edu/show/zk51vd69n1r> <http://purl.org/dc/terms/contributor> _:b0 .
  <https://curate.nd.edu/show/zk51vd69n1r> <http://projecthydra.org/ns/relations#hasEditorGroup> <https://curate.nd.edu/show/q524jm23g92> .
For the first two N-Triples you would get a BlankNodeHandler; For the last two, you would get a UriSubjectHandler

Parameters:

  • statement (RDF::Statement) —

    • the RDF statement that we will parse and add to the appropriate spot in the accumulator

  • accumulator (ROF::Translators::JsonldToRof::Accumulator) —

    • a data accumulator that will be changed in place

Returns:

Raises:

  • (ROF::Translators::JsonldToRof::UnhandledRdfSubjectError) —

    when the RDF::Statement’s subject is not a valid type



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# File 'lib/rof/translators/jsonld_to_rof/statement_handler.rb', line 29

def self.call(statement, accumulator)
  new(statement, accumulator).call
  accumulator
end

.new(statement, accumulator) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/rof/translators/jsonld_to_rof/statement_handler.rb', line 38

def self.new(statement, accumulator)
  case statement.subject
  when RDF::URI
    UriSubjectHandler.new(statement, accumulator)
  when RDF::Node
    BlankNodeHandler.new(statement, accumulator)
  else
    raise UnhandledRdfSubjectError, "Unable to determine subject handler for #{statement.inspect}"
  end
end